CVE-2026-43158Network attack vector

Filesystem shutdown via overlapping xattr freemap entries

Published May 6, 2026 · Updated May 6, 2026

Out-of-bounds write in XFS in Linux Kernel allows remote authenticated users to corrupt filesystem metadata via crafted xattrs. xfs_attr3_leaf_add_work advances only one zero-length freemap entry as the leaf entry array grows, leaving another free-space range overlapping that array. Write access to an XFS file or exported share is required; repeated xattr additions can corrupt leaf metadata and force an XFS shutdown.

CVSS severity8.8
High
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in XFS in Linux Kernel allows remote authenticated users to corrupt filesystem metadata via crafted xattrs. xfs_attr3_leaf_add_work advances only one zero-length freemap entry as the leaf entry array grows, leaving another free-space range overlapping that array. Write access to an XFS file or exported share is required; repeated xattr additions can corrupt leaf metadata and force an XFS shutdown.

The record

CVE
CVE-2026-43158
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <24ce71852f2cee6581e2cbebc15489ed52bf63b7
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <38613c01f69e1e77e6b8acab1e8ac665d01c2f15
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3eefc0c2b78444b64feeb3783c017d6adc3cd3ce
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <43f3b18679615a93bd848afde3602ba160637a46
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6a8737afbccc340e718e0b22577312826390be8b
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a396b3d73d51355e50acdb403ba9c4cae4c1174e
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d08976725355b9d54d8332fce223fa281cc304a5
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ef42a8766ff3fdf51cf72fb36d0859c09d134478
  9. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <24ce71852f2cee6581e2cbebc15489ed52bf63b7; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <38613c01f69e1e77e6b8acab1e8ac665d01c2f15; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3eefc0c2b78444b64feeb3783c017d6adc3cd3ce; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <43f3b18679615a93bd848afde3602ba160637a46; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6a8737afbccc340e718e0b22577312826390be8b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a396b3d73d51355e50acdb403ba9c4cae4c1174e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d08976725355b9d54d8332fce223fa281cc304a5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ef42a8766ff3fdf51cf72fb36d0859c09d134478; version=2.6.12

Published CVSS scores

8.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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